http://blogs.scientificamerican.com/media/inline/blog/Image/Rocket-flight-blog.jpgtry using some technology& D( o% ^# V. d
Pedestrian_A 發表於 2016-2-19 04:22 PM
i4 i, r. s. E" ^' b6 M% j 5 r1 g, i& `7 t1 }New technology is not good here it will skip your floors.